<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>flex布局</title>
</head>
<style>
  .father {
    display: flex;
    flex-direction: row;
    /*简写*/
    /*排列方向 是否换行*/
    flex-flow: row wrap;
    justify-content: space-between;
  }

  .son {
    margin: 10px;
    width: 100px;
    height: 100px;
    background-color: pink;
  }
</style>

<body>
  <div class="father">
    <div class="son"></div>
    <div class="son"></div>
    <div class="son"></div>
    <div class="son"></div>
  </div>

</body>

</html>